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Topic: detecting multiple keypresses/releases (Read 1157 times) |
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elbucanero
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detecting multiple keypresses/releases
« on: Apr 21st, 2004, 11:53am » |
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hey all, new to this forum,
so far i've done a little processing and i'm now looking at it in the hope of finding a way to detect more than one keypress and release.
So if i press "A" and "S" at the same time and after that release only "S" i'd like to know that S is released and A is still pressed.
Anyone know how to do this? Or else an easy program with audio possibilities that can do this?
Thanks a lot,
Tim
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fry
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Re: detecting multiple keypresses/releases
« Reply #1 on: Apr 21st, 2004, 1:32pm » |
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just use:
void keyPressed() {
}
void keyReleased() {
}
which will be called as the key is pressed or released. if you need an easy way to keep track, use:
boolean pressed[] = new boolean[128];
void keyPressed() {
pressed[key & 0x7f] = true;
// the &0x7f just means to only allow numbers < 128
/*
then you can do things like
if (pressed['S']) {
println("blah!");
}
*/
}
void keyReleased() {
pressed[key & 0x7f] = false;
}
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elbucanero
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Re: detecting multiple keypresses/releases
« Reply #2 on: Apr 21st, 2004, 4:01pm » |
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Thanks!
It works like a charm!
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elbucanero
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Re: detecting multiple keypresses/releases
« Reply #3 on: Apr 21st, 2004, 6:29pm » |
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Hmm not so charming afterall.
It only detects a maximum of 2 keys at once.
I want to use a total of 14 keys actually, though not all will be pressed at the same time. An amount of 4 or 5 would be enough.
Is this possible?
Thanks,
Tim
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toxi_
Guest
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Re: detecting multiple keypresses/releases
« Reply #4 on: Apr 21st, 2004, 7:24pm » |
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that will most likely be a hardware issue as there're not many keyboards around which will manage more than 3 keys (excluding modifier keys like shift/ctrl/alt). most of the cheaper keyboards will only manage 2 keys... i believe it has to do with the internal wiring of the keyboard matrix.
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elbucanero
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Re: detecting multiple keypresses/releases
« Reply #5 on: Apr 21st, 2004, 9:41pm » |
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my 17 inch 1,33 ghz powerbook has a cheap keyboard?
i feel dirty. hehe
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toxi_
Guest
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Re: detecting multiple keypresses/releases
« Reply #6 on: Apr 22nd, 2004, 12:52pm » |
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well, if it hurts too much, just think about it from that point of view: your keyboard isn't necessarily cheap. why would a keyboard need to register more than 2-3 keys at all? keyboards still are made (to 99%) for typing text and even the fastest typer won't hit more than that 2-3 keylimit at once... sadly, it's all down to economics, even in "branded" products...
also check diz
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elbucanero
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Re: detecting multiple keypresses/releases
« Reply #7 on: Apr 23rd, 2004, 11:53am » |
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I modified the code a bit, now it checks if a key is toggled, not just pressed. This works great keyboard wise, no problems with keyjamming.
Cool 
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